Introduction: Nudose erythema is a panniculitis, of relative frequency, that it is expressed like a manifestation of internal disorders of great significance, like the illnesses of the connective tissue, the infectious diseases and the cancer. So the patients that show it, must be studied carefully in search of the cause. Objective: To Present a nudose erythema clinic case highlighting the diagnose of parasitical cause. Case’s presentation: Is show the case of a white female patient, 29 years old, resident at rural municipality (Jatibonico), elementary school teacher, without pathological past health history, that assist at the consult for nodular due to a high very painful erythema on the anticus surface of both inferior members, general discomfort and arthralgia. Was clinically diagnosed a nudose erythema, and during several months were performed complementary to establish the possible cause, finding only an intestinal parasitism for Ascaris lumbricoides . He received medical treatment with antiparasitcs, disappearing the erythema. Conclusions: The accurate diagnostic, furthermore, a constantly cause searching of the cause of the nudose erythema plus the treatment of parasitism found, solve the patient’s problem. Nudose erythema always must be studied due to the possibility to be a reactive syndrome of seriously ill process. Key words: Nudose erythema, cause, intestinal parasitism, ascaris lumbricoides, diagnostic.